Exchange and Network issues because Multicast setting

Exchange and Network issues because Multicast setting

Situation: There are two Dell servers as hosts and setup failover cluster for Exchange 2010. The users complaints the email is slow and we get a lot time out when ping the Exchange CAS.

Troubleshooting: We found the two CAS servers have different cluster operation mode, one is setup Multicast and another is Unicast. Based on our Cisco switch configuration, both CAS should use Unicast.

Note: to use Unicast or Multicast depend on your network environment. More discuss can be found this link: Configure NLB for Exchange 2010 - unicast or multicast

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